Piercedaspid !link! -

Their "pierced" sensory system was their primary tool for survival. By sensing the vibrations of nearby predators—such as the formidable sea scorpions (Eurypterids)—the Piercedaspid could use its streamlined shape to execute a sudden, albeit clumsy, burst of speed to find safety in the sediment. The Evolutionary Legacy

Pierced aspids are designed to withstand the stresses of high-velocity impact and penetration. They typically consist of: piercedaspid